LCD screens, or Liquid Crystal Displays, are flat-panel displays commonly used in televisions, computer monitors, and smartphones. They work by using liquid crystals that change alignment when an electric current passes through them, allowing light to pass or be blocked. This technology enables vibrant colors and sharp images while consuming less power compared to older display types. The structure of an LCD screen includes several layers, including a backlight, polarizers, and the liquid crystal layer itself. The backlight provides illumination, while the polarizers help control the light's direction. Overall, LCD screens are popular for their slim design and energy efficiency.